The Tor Browser: content/media/wmf/WMFUtils.h@44a2da4a2ab2

Replace accessor implementation with direct member state manipulation, by
request https://trac.torproject.org/projects/tor/ticket/9701#comment:32

     1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

     2 /* vim:set ts=2 sw=2 sts=2 et cindent: */

     3 /* This Source Code Form is subject to the terms of the Mozilla Public

     4  * License, v. 2.0. If a copy of the MPL was not distributed with this

     5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     7 #ifndef WMFUtils_h

     8 #define WMFUtils_h

    10 #include "WMF.h"

    11 #include "nsString.h"

    12 #include "nsRect.h"

    13 #include "VideoUtils.h"

    15 // Various utilities shared by WMF backend files.

    17 namespace mozilla {

    19 nsCString

    20 GetGUIDName(const GUID& guid);

    22 // Returns true if the reader has a stream with the specified index.

    23 // Index can be a specific index, or one of:

    24 //   MF_SOURCE_READER_FIRST_VIDEO_STREAM

    25 //   MF_SOURCE_READER_FIRST_AUDIO_STREAM

    26 bool

    27 SourceReaderHasStream(IMFSourceReader* aReader, const DWORD aIndex);

    29 // Auto manages the lifecycle of a PROPVARIANT.

    30 class AutoPropVar {

    31 public:

    32   AutoPropVar() {

    33     PropVariantInit(&mVar);

    34   }

    35   ~AutoPropVar() {

    36     PropVariantClear(&mVar);

    37   }

    38   operator PROPVARIANT&() {

    39     return mVar;

    40   }

    41   PROPVARIANT* operator->() {

    42     return &mVar;

    43   }

    44   PROPVARIANT* operator&() {

    45     return &mVar;

    46   }

    47 private:

    48   PROPVARIANT mVar;

    49 };

    51 // Converts from microseconds to hundreds of nanoseconds.

    52 // We use microseconds for our timestamps, whereas WMF uses

    53 // hundreds of nanoseconds.

    54 inline int64_t

    55 UsecsToHNs(int64_t aUsecs) {

    56   return aUsecs * 10;

    57 }

    59 // Converts from hundreds of nanoseconds to microseconds.

    60 // We use microseconds for our timestamps, whereas WMF uses

    61 // hundreds of nanoseconds.

    62 inline int64_t

    63 HNsToUsecs(int64_t hNanoSecs) {

    64   return hNanoSecs / 10;

    65 }

    67 // Assigns aUnknown to *aInterface, and AddRef's it.

    68 // Helper for MSCOM QueryInterface implementations.

    69 HRESULT

    70 DoGetInterface(IUnknown* aUnknown, void** aInterface);

    72 HRESULT

    73 HNsToFrames(int64_t aHNs, uint32_t aRate, int64_t* aOutFrames);

    75 HRESULT

    76 FramesToUsecs(int64_t aSamples, uint32_t aRate, int64_t* aOutUsecs);

    78 HRESULT

    79 GetDefaultStride(IMFMediaType *aType, uint32_t* aOutStride);

    81 int32_t

    82 MFOffsetToInt32(const MFOffset& aOffset);

    84 // Gets the sub-region of the video frame that should be displayed.

    85 // See: http://msdn.microsoft.com/en-us/library/windows/desktop/bb530115(v=vs.85).aspx

    86 HRESULT

    87 GetPictureRegion(IMFMediaType* aMediaType, nsIntRect& aOutPictureRegion);

    89 // Returns the duration of a IMFSample in microseconds.

    90 // Returns -1 on failure.

    91 int64_t

    92 GetSampleDuration(IMFSample* aSample);

    94 // Returns the presentation time of a IMFSample in microseconds.

    95 // Returns -1 on failure.

    96 int64_t

    97 GetSampleTime(IMFSample* aSample);

    99 inline bool

   100 IsFlagSet(DWORD flags, DWORD pattern) {

   101   return (flags & pattern) == pattern;

   102 }

   104 } // namespace mozilla

   106 #endif

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